Stapling machine



March 30, 1954 E. e. SANDBERG STAPLING MACHINE 9- Shuts-Sheet 1 Filed Sept. 15, 1952 March 30, 1954 sANDBERG 2,673,344

STAPLING MACHINE Filed Sept. 13, 1952 9 Sheets-Sheet 2 ids/275 w z .T na/ 21mm? fltzzzobez'g j w r A 0% March 30, 1954 E. G. SANDBERG 2,673,344

STAPLING MACHINE Filed Sept. 13, 1952 9 Sheets-Sheet 4 4 70a!" Gzmzzar Ema berg a M w 9 Sheets-Sheet 5 Filed Sept. 13, 1952 March 30, 1954 E. G. SANDBERG STAPLING MACHINE 9 Sheets-Sheet 6 Filed Sept. 13, 1952 //2de72 02 6720/" Gzzzzzzar Sazzdbezy March 30, 1954 SANDBERG 2,673,344

STAPLING MACHINE Filed Sept. 13, 1952 9 Sheets-Sheet '7 E.G.SANDBERG March 30, 1954 STAPLING MACHINE 9 Sheets Sheet 8 Filed $9912. 13, 1952 March 30, 1954 G. SANDBERG 2,673,344

STAPLING MACHINE Filed Sept. 13, 1952 9 Sheets-Sheet 9 Patented Mar. 30, 1954 UNITED STATES gram OFFlC STAPLING MACHINE of Maine Application September 13, 1952, Serial No. 309,392

15 Claims.

A further object of my invention is to provide a novel and improved stapler of the fluid pressure operated type forming its staples from a continuous length of wire and driving the same in a single staple driving operation and arranged with a view toward utmost simplicity, compactness and efiiciency in construction and operation.

A further object of my invention is to provide a simple and readily maneuverable stapler particularly adapted for stapling springs to the framing of box springs, and having an elongated nose readily fitting between the springs and formed at its end to engage the Wire of the spring and guide the staple to pass along opposite sides thereof during the staple driving operation.

A still further object of my invention is to provide a simple and novel form of fluid pressure operated stapler having a central passageway extending therealong and a fluid operated staple drive plunger moving along said passageway, together with a novel form of anvil arrangement movable into and out of the passageway in cooperation with forming dies to form the staple and moving out of the path of the plunger upon the completion of the staple forming operation, to accommodate the plunger to move therebeyond and drive the staple.

Still another object of my invention is to provide a novel and improved form of fluid operated stapler for forming staples from continuous wire and driving the same in which the feeding of the wire and shearing thereof into staple lengths together with the forming of the wire into the form of staples is all operated by the operation of a single staple drive plunger.

A still further and more detailed object of my invention is to provide a novel and improved form of stapler for forming staples from a continuous wire wherein a reciprocating staple drive plunger operates to drive the staples, and wherein a simple form of feeding mechanism operated by the return stroke of the plunger is provided to intermittently feed the wire thereto in increments of staple length.

A still further object of my invention is to pro- .2 vide a novel and improved form of stapler for forming staples from continuous wire and driving the same, wherein reciprocating pivotally moving forming dies form the staple about an anvil and wherein one of the forming dies serves to shear the wire fed thereto to staple length and to point the wire during the shearing operation.

Still another and more detailed object of my invention is to provide a novel and improved form of stapler particularly adapted to staple the springs of box springs to the framing thereof in which increments of wire of staple length are fed to the staple drive plunger from a continuous strand of wire and are then sheared and formed to staple like form and driven all by the operation of the staple drive plunger.

These and other objects of my invention will appear from time to time as the following specification proceeds and with reference to the accompanying drawings wherein:

Figure 1 is a view in side elevation of a stapler constructed in accordance with my invention showing a staple being driven along the staple guide in the nose of the stapler;

Figure 2 is an end view of the stapler shown in Figure l with the staple drive plunger in substantially the same position as in Figure 1;

Figure 3 is a fragmentary sectional view taken substantially along line III-III of Figure 2;

Figure 4 is a sectional view taken substantially along line IVIV of Figure 2 and showing the cylinder and piston for operating the staple drive plunger;

Figure 5 is a sectional view taken substantially along line V-V of Figure 4;

Figure 6 is an enlarged fragmentary longitudinal sectional view taken through the lower end of the cylinder and piston rod for driving the staple drive plunger along the stapler housing and nose thereof;

Figure 7 is an enlarged detail fragmentary sectional view taken through the nose of the stapler housing and showing the operation of driving a completely formed staple therealong;

Figure 8 is an enlarged fragmentary side view of the end portion of the nose of the stapler;

Figure 9 is an enlarged fragmentary end view of the stapler nose shown in Figure 8;

Figure 10 is a sectional view taken substan tially along line X-X of Figure 8 and illustrating the staple guide;

Figure 11 is a fragmentary enlarged longitudinal sectional view taken substantially along line XIXI of Figure 2, but showing the anvil in position within the stapler housing;

V Figure 12 is a view somewhat similar to Figure 11 but showing the staple forming arms and dies at the completion of the staple forming operation;

Figure 13 is a transverse sectional View taken substantially along line XIII--XIII of Figure 12 showing the form of the staple guide at an intermediate position along the stapler nose;

Figure 14 is a sectional view taken substantially along the line XIV-XIV of Figure 11 and showing the forming anvil extended within the forming chamber of the stapler;

Figure 15 is a sectional view taken substantially along line XVXV of Figure 12 and showing the feeding mechanism for the wire in transverse section.

Figure 16 is an enlarged fragmentary detail end view looking toward the .wire guide at the:

entering end of the stapler housing;

Figure 17 is a sectional view taken substantially along line XVIL-XVII of Figure 16 and showing certain details of the wire guide not shown in,

Figure 16;v

Figure 18 is a horizontal sectional view taken substantially along line XVIII-XVIII of Figure 12 and showing certain details of the feeding mechanism; and support for the actuating cams for the forming dies;

Figure 19 is a horizontal'sectional view taken substantially along line XIX-XIX of Figure 12 in order to show certain details of the forming arms and dies and the cooperation thereof with the forming anvil;

Figure 20 is a perspective view showing the lower end portion of the piston rod and the staple drive plunger;

Figure 21 is a perspective view of one of the staple forming arms and dies, showing a shearing blade attached thereto for shearing the wire into staple length;

Figure 22 is a perspective view of the stationary wire cutting block cooperating with the shearing blade on the forming arm shown in Figure 21;

Figure 23 is an enlarged fragmentary view of the front plate of the stapler housing showing the anviland wire cutting block mounted thereon;

Figure 24 is a top plan view of the front housing plate shown in Figure 23;

Figure 25 is a view in side elevation of the front housing plate shown in Figure 1 showing the anvil Y and wire guide to the staple forming chamber;'

Figure 26 is a front view of the back plate for the staple housing;

Figure 2'] is a top plan view of the plate shown in Figure 26; and

Figure 28 is aview in side elevation of the back plate shown in Figure 26. 7

Intthe embodiment of my invention illustrated in thedrawings, I have shown a stapler l0 having a housing H with a thin elongated nose i2 extending therefrom, along which staples l3 formed from a continuous length of wire I 5 are driven by a staple drive plunger 15, to eifect the stapling operation.

As herein shown, the nose 12 is sufiiciently long and thin to be inserted between the coils of a box spring from the top thereof into engagement with the bottom coil of the spring for stapling the spring to the spring frame, which usually is of wood. The nose- I2 is shown as having a plate l6 secured to the front face thereof and closing an open guide ll, extending downwardly along said nose. The guide H is shown in Figures '7,

ill

10 and13 as having recessed V-shaped walls l8,

and holding the staple in position during the driving operation thereof. The plate it also has a downwardly opening recess l9 engageable with the wire of the bottom coil of the spring and enabling the nose 12 to readily position and guide the staple to pass along opposite sides of the wire of the coil of the spring.

At the upper end of the housing i i is a cylinder 28, which is recessed therein at its lower end, asishown in Figure 6, and extends upwardly therefrom.

The upper end of the cylinder 20 is closed by a head 2i, secured thereto by tie rods 22, extending therethrough. from the housing H and having nuts 23, 23 threaded on the opposite ends thereof. Thenuts 23; 23 are shown as being in abuttingengagement with the top of the head 2i and with undersur'faces of recesses 2Q, 24 formed in the housing H.

A pipe 25 is shown as being threaded in the head 2] andleading therethrough to supply fluid under pressure. to the head end of the cylinder 28. The pipe 25 is shown as having a valve 21 threaded .on the upper end thereof. The valve 2i is provided to control the admission and release of fluid under pressureto and from the head and piston rod ends of the cylinder 28. The valve 2i may be of any wellknown formcommonly used to admitand release fluid under pressure to and I from fluid motors, so need not therein be shown or described in detail.

Movable within the cylinder 2B is a piston 29 and piston rod 353. The piston. 29 may be of any 7 well known form, and is herein shown as in-v cluding two facing flexible cups 3!, 3i which may be made from leather mounted on the upper end of the piston rod 3iand abutted at their outer ends by disks 32,32. As herein shown, the lower disk 32 abuts an upwardly facing shouldered portion of said piston rod and the upper disk 32 is abutted by a nut. 33 threaded on the upper end of.

said rod.

The piston through thebottom of the cylinder 20 into the interior of thehousing H and as being movable therealong and as having the staple drive plunger ldsecured to the lower end thereof and offset; therefrom. The length of the driving stroke-of the.pist on 29 .is shown as being limited by a spring. 34 extending upwardly into the bottom. portionof the cylinder 20 The S ring, 34 may be .a relatively stiff spring, so as to .form a positive yieidable stop foiithe piston 29.-

Theistaple drive plunger it upon its :driving str'oke;..efiected by the admission of iiuidunder pressure to the head end of the cylinder 20', be

sides drivingthe staple also p-ivotally moves two I to the form thereof and also to retract the anvil, to accommodate saidplunger to engage and drive p th staple. Upon. retractable movement of the piston rod 30 and staple, drive. plunger i5, said plunger also operates to effect operation of an intermittent feed 1101158, .for feeding. the .wire.

I4 ,in increments of staple length and also re turns the forming arms 35 and dies 31 into positionto again be engaged with the wire on .opposite sides of the anvilfi andextends the anvil into operative position with respect to said dies,-. iit being.understoodthat the feeding of the wire rod 38 is shown as depending. from the piston'ZS and as being extensible downwardly is effected after the forming dies are in the retracted position shown in Figure 11.

The valve 2? is herein shown for illustrative purposes as being a spool type of valve having a spool or plunger movable within and along a valve block t3. Fluid under pressure is admitted to said valve block through a fitting M, which may be connected with a flexible conduit connected with a source of supply of fluid under pressure such as air. The valve 2'! is connected with the head end of the cylinder 26 through the pipe 25, and is connected with the piston rod end of the cylinder 26 through a pipe 45. A spring 41 seated between a shouldered portion of the valve block 2| and a sealing cap it secured to one end of the valve spool M by means of a nut 49, is provided to bias the valve spool ii into position to admit fluid under pressure to the piston rod end of the cylinder 28 and retract the piston rod 30 and staple drive plunger l5.

A lever arm 5i] connected with the opposite end of the valve spool 41 from the spring 4?, is provided to move the valve spool into position vto admit fluid under pressure to the head end of the cylinder 22 and to release fluid under pressure from the piston rod end thereof. The lever arm 50 is pivoted to a bracket 5| on a pivot pin 52. The bracket 5! is shown as extending downwardly and outwardly from the valve block 3.

The free end of the lever arm 50 is shown as extending within a bifurcated end portion of the spool Al and as having engagement with a pin 53 extending thereacross. The lever arm 50 is shown as being operated by a link 5 pivotally connected at one of its ends with said lever arm, intermediate the ends thereof. The link 54 is shown as being spaced from and extending along the block 43 and having connection at its end opposite the lever arm 59 with one lever arm of a bell crank 55. The other lever arm of the bell crank 55 extends inwardly from the pivot thereof and has an operating rod 56 pivotally connected thereto and depending therefrom. The rod 56 is shown as being slidably guided at its lower end in a bracket 58 conveniently located with relation to a hand grip 5'! for the stapler. A finger grip 59, extending inwardly from the rod 56 is provided to be engaged by a finger of the hand holding the hand grip 5?, to operate the valve 27 as desired.

Th housing H is shown in Figures 11 and 12 as having a central forming chamber therein with a guide passageway 85 for the piston rod 30 and staple drive plunger l5 leading thereinto from the cylinder 28, and the staple guide I 1 leading therefrom along the nose i 2. The forming chamber $5 is shown as being formed within a main front plate 69 of the housing Ii and as being partially closed by a back plate 70 secured to said front plate.

The front plate 69 as shown in Figures 1, 2 and 23 through 25 conforms generally to the form of the back plate 78 and is partially recessed therein. A relatively large opening H is provided in the plate '19 leading into the forming chamber 65 and affording a means of access to said chamber, to enable fouled staples to be removed therefrom. The front plate 69 is shown as having a block 12 mounted on the front face thereof and extending outwardly therefrom. The block 12 is shown as having a slot i3 extending therealong and opening to the inside of the front plate 69 and guide passageway extending therealong and the forming chamber 55 formed therein. A, lever arm 14, shown as having the anvil 36 formed integrally with the lower end thereof is shown as extending along the slot 13 and as being pivoted to the block 12 on a pivot pin 15. The slot 13 is shown as having facing recessed V-shaped guides l6, 18 extending therealong in alignment with the guides [8, I3 and slidably engaged by corresponding and oppositely extending V-shaped guide surfaces H, I! (Figure 20) of the staple drive plunger !5 and forming a rectilinear guide for said plunger for a portion of the length of the stroke thereof.

The back plate ii? is shown in Figures 26, 27 and 28 as having an opening "I9 therein registering with the central forming chamber 65 and with the open portion ll of the front plate 59, and affording a means for clearing fouled or jammed staples from the forming chamber 65. The back plate IE is also recessed to form a support and casing for the intermittently driven feed roll 38 and mechanism for driving said roll to intermittently feed the wire 14 to the forming chamber 65 in staple length increments.

The step-by-step feeding mechanism includes the feed roll 38, shown as being mounted on a transverse shaft 8i. The shaft 81 is mounted at one of its ends in the back plat iii and at its opposite end in a cover plate 83 therefor. The feed roll 38 is shown in Figure 15 as having a wire engaging groove 84 recessed in the periphery thereof and extending therearound. The groove 84 is shown as generally V-shaped in cross section with a curved bottom and engaging the wire with a wedging action to positively propel the wire into the forming chamber 65. The groove in the feed roll 38 is shown as being axiall aligned with a guide aperture 85 formed in an end wall 86 of the rear plate iii. The guide aperture 85 is shown as being of a generally bell shaped form in axial alignment with a wire guide tube 8?, shown as being mounted on and extending from a bracket 88 extending rearwarclly from the wall 86 of the back plate iii (see Figures 11 and 19) The wire is maintained in engagement with the groove Se in the feed roll 38 by a means of a pinch roll 89 having a flat periphery and shown as being rotatably mounted on a bifurcated lever 90, between the furcation thereof and intermediate the ends thereof, on a pivot pin 9|. The lever is shown as being pivotally mounted to the back plate It on a pivot pin Q3. A compression spring 9% is shown as being interposed between a bottom wall 95 of the back plate 70 and under surface of the lever 93 to continually urge the pinch roll 89 into engagement with the feed roll 38. The end of the lever 98 projects outwardly from the back plate It and affords a means to be gripped by the fingers to release the pressure of the pinch roll 89 from the feed roll 38 when it is desired to initially thread wire to the stapler.

The feed roll 38 is herein shown as being intermittently driven through a step-by-step or ratchet feed, operated by movement of the piston rod 3%! and plunger [5. As herein shown, a pinion 95' on the shaft 8i meshes with and is driven by a spur gear 9'! on a shaft 99, mounted at its ends in the back plate 76 and the cover plate 83 for said back plate. The pinion Q6 may be suitably secured to the feed roll 38 for rotating the same. The spur gear 9! may be suitably secured to the shaft 99 and is shown as being driven by a ratchet wheel lilii, which also may be secured to said shaft. A rocking segment Ifii is shown as being rookingly mounted on the shaft 99 and as having a pawl Hi3 pivoted thereto on the inner face thereof for engagement with the teeth of the ratchetwheel I09. E'I'h pawl I93 is showngas loc ing;yieldably.engaged with the :ratchet wheel IIIII 1 by a torsion. spring; I '34 onapin I05;

'I'he,sector..;II3I is rocked by a link I. I!5,'pivotal1y connected to ,theopposite end thereof from the pawl I03on a, pivot pin IIII; The-upper endof the link lflfi is shownas being pivotally connected; to the:outer end of a rocking arm I39-on a pivot pin III!.. The rocking arm is shown as beingpivoted intermediate itsends to the housing I I on a pivot pin I I I and as ,extendingthrough an opening I08 in saidhousing. The rocking arm I09 has a camming or engaging end II2 extending into thep-assageway 66.,- The engaging end I I2 is engageable with an upper abutment surface II5 ofthe staple drive plunger I5 upon theretulfn,

strokes thereof. Thisefiects pivotal movement of the rocking arm I99 in a clockwise direction A and the sector IQI in a counter-clockwise, direction to rotate the ratchet teeth IIIII and the gear 91 in a counter-clockwise direction, and drive the feed roll 33 in a clockwise direction a distance suflicient' to feed increments, of wire of staple length to the chamber 65, during each return strokeof ,thestapledrive plunger I5. The rock- I ing;.arm IE9 is biased in the retracted position shown in Figure 12, to be engaged and operated by,,thev staple drive plunger II5 by means of a torsion spring II 6. fIhe torsion spring H6 is shown as beingmounted on a pin I I? mounted in the opening or slot I08 of the housing I I and as,

engaging the rocking arm IE3 at one of its ends and the bottom of theopening IE8 at its opposite end (see Figures 1 and 12) From the feed roll.33 and the pinch roll 89, the wire- I4 is shown as passing through a wire guide IIB-in a stationary'wire cutting block H9 (see Figures l1, 12, 17, 19,22 and 23).

The wire cutting block H9 is shown in Figure 7 as .being adjustably mounted in a slot I 1 formed in the front plate at of the housing I I for adjustable movement therealong to adjust said block with respectto a cutting blade I2I, shown asbeing nounted on the right hand forming arm 35.inwardly;of the die 31, thereof. The cutting block III! is secured in position to the front plate Bil-by means of two vertically spaced screws I22, I22 threaded in said cutting block and passing through elongated slots I23, I23 extending along said plate.

Adjustment of the cuttingblcck I I9 along the guide or recess IE8. is efiectedby means of two set screwsv IZ I,v I24, threaded in the end wall of the plate 69 and engaging a rear wall of the cutting block. II9.; An enlarged diameter wire guide or, aperture I25 having a converging or bell shaped entering end ,leads through said wall in axial alignment with the guide I I3 of the cutting block H9."

The wire cuttingblock H9 is shownas having an advance face I2'I generally conforming to the path of movement of the cutting blade I2I and cooperating therewith to shear the Wire at an angle along said face, and thus point the advance end. of the wire within the guide I18 and the retreatingend of the wire positioned for forming, upon downward movement of the forming. arms 35, and-dies 37, 31.

The cutting" blade I2I is shown as being se-.

cured to an angularly disposed face I99 of the right hand forming arm 35 just inwardly of the die 31 thereof by means of aset screw I38. The screw I30 is shown as extending from the inner end of the forming die through avertically extending slot I'3I therein and as having threaded engagement'with" the cutter blade I2I'; 'The angular ,fac'e I99 ;b-eside positioning the :cutter blade I2I in the proper positionto.cooperate with the arcuate face,;I2I .of the wire cutting block He also offsets :the forming die, 31 :from the main, body of the forming arm 35, to position the-center of the die surface in direct align,-. ment with the center of the wire to be formed. Referring now to the'staple forming mechanism and operation, the staple. drive plunger .I5 is shown as being offset outwardlyjfrom the pise-p;

ton rod 38 and as being guidedwithin. and/move able along the recessed guides 16,16 prior to and.

during the staple forming operation, :and along:

the guides I8, I8 formed in the nose..I:2 during:

the staple driving operation. Thelower endof L,

the staple drive, plunger I5 is shown as being- 3 recessed as indicated by reference character I35szt.

The recess I35 opens towardthe ground-andf.

generally conforms to the. form of the. closed...

end of therfinished staple and serves to engage;

arm 74 spaced on opposite sides of the pivot pin I5 to retract said anvil from the forming cham:- ber 65 upon completion of the forming opera titn of the staple and accommodatethe staple to be propelled along the guide 61 by the plunger I5 and to extend said, anvil within the forming chamber upon theyreturn strokev of the drive plunger I5. Two detentoballs I49 and I50 are. provided on opposite sides of the pivot pin 15 to 2' hold the rocking arm I i and anvil 3.3 in operative and retracted positions with respect to the form-- ing chamber 35. The twodetent balls I49 and I58 are spring pressed and the ball I49 is en gageable with a recess I5 I formed in the rocking arm I 33 adjacent the upperor outer end'thereof, to yieldably hold the anvil 36 within the forming chamber 65. jThe detent ball I59 is spacedw on the opposite side of the pivotal axis of the" rocking arm 14 from the detent bal1I49 for en-. gagement with a detent recess I52 formed in the rocking arm I4, to hold the anvil 36 out of the way of the plunger I5 during the staple driving operation thereof.

The forming arms .35, 35 are shown as being pivoted on opposite sides of the forming. charn- 2:.

leer-65 on pivot pins I53,1I53 mounted at their ends in the plates 69 and III and suitably locked. thereto. The forming arms 35, 35 are of simi-. I

lar construction exceptthe .righthand .or ad Vance forming arm alsocarries the wire cutting blade I2I, as hasbeen previouslydescribed, The forming dies 31, 31 are of a recessed generally v-shapedform in cross section, the depth of the recess'depending upon'the gaugeof wire used, and pivot downwardly along opposite sides of the anvil 38 into engagement with the wire anddraw th wire downwardly-along opposite sidesof the anvil 36 and conform the wire to the form The dies remain in the position shown e in Figure I2 upon withdrawal of the anvil and: 1

thereof.

have guiding engagement with the inclined guide surfaces of the staple drive plunger I5, and guide said plunger from the guides I6, '16 to theguides,

The forming arms 35.15am operated by actuating cams I56, I56 mounted between the plates 69 and 16 on pivot pins I53, I59. Said actuating cams are shown as being disposed above the forming arms 35, 35 inwardly of said forming arms and in direct alignment with camming lugs I51, I51 extending laterally from the staple drive plunger I5. As herein shown, links I6I, I6I are pivoted to the actuating cams I56, I56 intermediate the ends thereof on pivot pins I62, I62. Said links have pivotal connection with the actuating arms 35, 35 adjacent the lower ends thereof and intermediate the ends thereof on pivot pins I63, I63. Th links I6I, I6I are shown as being recessed within and movable along recesses I64, I64 formed in the back plate 10.

The actuating cams I56, I56 have facing vertically spaced camming surfaces I13, I16 adapted to be engaged by the camming lugs I51, I51, on the plunger I to pivot the cams I 56, I56 upwardly upon the return stroke of the staple drive plunger by engagement of the camming lugs with the camming surfaces I13, I13. This will pivot the forming arms 35, 35 upwardly of the path of travel of the wire into the position shown in Figure 11.

The camming lugs I51, I51 are engageable with th camming surfaces I14, I14 of the actuating cams I56, I 56 upon the staple driving stroke of the plunger and positively pivot the actuating cams I56, I56 downwardly and move the forming arms 35, 35 and dies 31, 31 simultaneously downwardly to first effect the severing and pointing of the wire into a piece of staple length extending across the forming chamber 65 into position to be engaged by the undersurfaces of the forming dies 31, 31 and then finish bend the wire about the anvil 36.

The cams I56, I56 are each provided with spaced detent recesses I16, I16 herein shown as being formed in the camming projections I13 and I14. The recesses I16, I16 are adapted to be engaged by spring urged detent balls I19, I19 mounted in drilled holes I85 in the block 13 and extending therethrough from the outer face thereof. The detent balls I19, I16 are provided to hold the actuating cams I 56, I 56 and the forming arms 35, 35 and dies 31, 31 in the upwardly extending position shown in Figure 11 and in the guiding position shown in Figure 12 until positively moved out of said position by 'fi.

operation of the actuating cams I56, I56 efiective by movement of the staple drive plunger I5 on its driving and return strokes.

In operation of the stapler, the staple drive plunger I5 is moved to its uppermost position Z:

along the guide passageway 65 by the admission of fluid under pressure to the piston rod end of the cylinder 25, upon the release of the finger grip 59 on the rod 56. During return movement of the plunger I5, the upper camming surface 6 I36 will first engage the camming surface I45 on the anvil arm 13 and extend the anvil within the forming chamber 55. The camming lugs I51, I51 will then engage the camming surfaces I13, I?3 on the actuating cams I 55, I 56 and pivot said cams and the forming arms 35, 35 to the upwardly extended position shown in Figure 11. The engaging surface II5 of the plunger I5 w ll then engage the camming end I 52 of the rocking arm I39 and pivot said rocking arm to the upwardly extended position shown in Figure 11 and effect the feeding of an increment of wire of staple length to the forming chamber 65.

Upon the exertion of pressure on the finger grip 59 to move the valve spool M to the left from the position shown in Figure l, fluid under pressure will be admitted to the head end of the cylinder 26. This will effect the staple driving stroke of the piston 29, piston rod 39 and staple drive plunger I5. The camming lugs I51, I51 of the staple drive plunger I5 will first engage the camming surfaces I14, I14 of the actuating cams I56, I56 and pivot said cains downwardly. This turn will efiect downward pivotal movement of the forming arms 35, 35 through the links I6I, I6I. Initial downward movement of the forming arms 35, 35 will move the cutter blade I 2i along the inclined surface I21 of the cutter block I I9, and sever the staple wire into a piece of staple length and point an end thereon.

The lower ends of the forming dies 31, 31 will then engage the upper surface of the wire of staple length on opposite sides of the anvil 36 and initially bend it over said anvil t0 the form shown by dot and dash lines in Figure 11. Continued movement of the forming arms and dies will pivot the dies downwardly into substantially parallel relation with respect to the sides of the anvil 35 and form the opposite legs of the staple along said anvil to conform to the form thereof. The advance inclined camming surface of the cam I 36 will then come into engagement with the cam I43 and pivot the anvil 36 outwardly out of the forming chamber 65 about the axis of the pivot 15. The anvil 36 and rocking arm 14 will now be held in the outwardly extended position shown by solid lines in Figures 2 and 24 and by broken lines in Figure 14 by the detent ball 556. The staple held in position in the apices of the dies 31, 31 will then be engaged by the recessed end portion I35 of the staple drive plunger I5 and be driven thereby along and out of the forming dies into and along the facing V-shaped recesses I 6, it of the guide I1 along the nose of the stapler.

Continued movement of the staple drive plunger I5 will then eject the staple from the end of the nose I2 along opposite sides of the wire of a spring coil, and drive the staple into the spring framing.

It should here be understood that the forming and driving operation is a continuous operation and that during the entire cutting, forming and driving operations, the staple drive plunger I5 is in continuous motion, the cutting, initial and final forming operations, the withdrawal of the anvil from the staple and the engagement thereof with the driving plunger all being in a predetermined timed sequence and accommodating free movement of the drive plunger with no interruptions thereof.

Upon release of the finger from the finger grip 59, the spring will return the valve spool 4| in position to relieve pressure from the head end of the cylinder and admit fluid under pressure to the piston rod end thereof and withdraw the piston rod 36 and staple drive plunger I5. During return travel of the staple drive plunger I5, the anvil 36 will be extended into the forming chamber 65 and will be held therein by engagement of the lever is with the detent ball I49. The forming arms 35, will then be returned to the upwardly extended positions shown in Figure 11 and a new length of staple wire will be fed to said forming chamber, as previously described The stapler is then ready for another driving operation upon operation of the valve 21 by engagement of the finger with the finger grip 51, as previously described.

It should here be noted that when stapling of the Wire and secure the same to the spring the upper end thereofand adj acentthe lower end of the cylinder 20 on a pivot pin NH. The hanger I3!) is shown as having an inwardly turned upper 1 arm portion Hi2 extending'at rightsangles with respect to the main body thereof and having an eye bolt l93 extending therethrough and secured thereto as by a nut I94. The eye bolt I93 may be attached to a suspension support, so arranged as to suspend the stapler for operation and accommodating the stapler for up and down and tilting movement with respect to the spring framing for.

insertion within the frame, to engage the recessed end thereof with the wire of a spring coil and guide a staple to'be, driven along opposite sides frame.

It should here be. understood that while 'I have herein referred to the stapler as being. used to stape or secure springs to the framing for box springs, that it need not beused for this purpose and may be used for any desired-stapling purpose.

It will be understood that various modifications and variations of the present'invention may be effected without departing from'the spirit and scope of the novel concepts thereof.

I claim as my invention:

1. A stapler comprising a housing having a guide nose extending therefrom with a staple guide within said nose and extending therealong, a staple drive plunger movable along said housing and nose and having a staple engaging and driving recess on the end facethereof, a fluid'pressure operated cylinder and'piston' mounted on said housing on the opposite. side thereof from said guide nose and having connection withsaid plunger to reciprocably move said plunger within and along siad housing and nose to effect the staple driving operation, afeed roll and a pinch roll mounted on said housing to engage the wire with said feed roll to feed wire into said housing in staple length increments, intermittent -drive mechanism actuated by said plunger to drive said feed roll, a shearing block mounted within said housing and having the staple wire guided therethrough in alignment with the point of engagement of said feed and pinch rolls and also having an inclined advance face, and means one of said dies having a shearing blade thereon cooperating with the inclined face of said cutting block to shear the wire to staple length upon the driving stroke of said plunger prior to'the forming of the wire into staple form.

2. A stapler comprising a housing having a guide nose extending therefrom with a:staple guide extending within and along said nose, a

staple drive plunger guided for movement within said housing and nose, said plunger having a staple engaging end face for progressing a staple 1 within said housing and nose to the end thereof and driving the same, a fluid operated motor to. reciprocablv move said driving plunger within saidhousingvand nose, means: actuated; by; operation'of said plunger to intermittently feed-staple wir within saidhousing; means to sever the wire to staple length and to point the-ends-thereof comprising a cutting block-secured :tosaid housing having a;wire guide extendingzthere- :through and-an inclined advance face, a shearing blade movable-along said: face to sever. the 'wireat the inclination thereof, and two-spaced 10, facing forming dies pivoted within-saidehousing to move from positions above saidtcutting block downwardly into parallelrelationwithrrespect-to each other along opposite sides ofthe path. of travel of said staple.drive--plungen-alongusaid housing, one of said dieshaving saidshearing blade secured thereto to-move said blade along said inclined surface of said cutting blockyboth of said forming dies: and arms-beingmoved into .forming engagement with the'staple -wire j-by movement of-saidstaple. drive plungeruponthe driving stroke thereof, an anvil movable; into the space between said dies and retractable .-therefrom, cam means on said plungerto, operate said forming dies, and other cam means: on; said plunger engageable with said anvil to retractzthe r same from the path of travel of. said plunger-upon the completion of the staple forming operation,

-andto move said anvil into operative position upon the return stroke of-saidplunger.

3. In a. stapler of the :class described, a housing, a plunger guided to move within said housing to the end thereof, and to eject thefinished-staple from the end of saidhousing, afeedroll" to feed a continuous .length of wire intosaid housing .in

a direction transverse. to thepath-and travel of aisaid plunger along-said housing; means actuated by reciprocable movement of :said plunger :to

1 drive saidfeed roll,- an anvil'pivotally mounted ..-;.on said housingto. move intoa-ndzout of the :path

of travel. of said plungenalcng said housing; a

; cam on said plunger engaging-saidianvil to:-p0sition the same in operative and-inoperative positions, two pivoted forming dies pivotallymounted :withinrsaid housing? on;opposite sides. of said :anvil, cam means operable by. movement. of said .yplunger to actuate said forming; dies, .and a cut- -ter; on vone'of said. formingidies to cut the wire ntostaple length.

4. In a stapler of .theclass describedahousin 50 a plunger guided to move within and along said housing, feed mechanism to feed the wire into said housing in a, direction transverseto the path of travel of said plungercomprising afeed-roll -and step-by-step-drive mechanism actuated by .said plungerto drivesaid feed roll, ananvil pivotally mounted on said housing to move into and out of the path of travel of said plunger, a

-;:cam on said plunger engageable with-said anvil to position, the same'in operative and inoperative positions, two forming. dies pivoted within said housing beneath said feed roll and movable into position to extend along opposite sides'of said anvil, actuating cams for said dies'pivoted in said housing and having operative'connection therewith, and camming means on said plunger engageable with saidcams to actuate the same topivot said forming dies in a forming direction into cooperation with said anvil.

5. In a stapler of the class described, a housing having a central'forming chamber therein, a

' staple guide passageway'extending in saidhousing from said chamber to the end of said housing,

a staple drive plunger movable along'said chamber and staple guide passageway to the' nd thereof, feeding mechanism operated ,bymovement' of said plunger to feed a continuous strip of wire into said chamber in a direction normal to the path of travel of said plunger including a feed roll spaced from said chamber, and means actuated by said plunger to intermittently drive said feed roll, an anvil movably mounted on said housing to move within said chamber into a position beneath the line of travel of said wire, two forming dies pivotally mounted within said housing on opposite sides of said anvil to move from a position above the line of travel of said wire downwardly into engagement therewith to form the wire on said anvil. one of said dies having a shear thereon to cut the wire to staple length, and means operated by movement of said plunger and operatively connected with said forming dies to simultaneously move said dies on the working stroke of said pl nger to first shear the wire and then form the wire on said anvil.

6. In a stap er of the c ass described. a housin having a centra forming chamber. a staple guide passageway in said housing extending from said form ng chamber and open n to one end of said housing, a staple drive lun er movable nto and out of said chamber to the end of said staple guide passageway. a step-by-step feeding mechanism mounted on said hous ng and actuated by said plunger to intermittently su ply wire to said chamber, an anvil pivoted on said housing outside of said chamber to move into said chamber beneath the line of travel of wire thereinto, means actuated by said plun er, to move said anvil into and out of said chamber, two forming dies pivotally mounted on said housimg on o posite sides of said chamber to move from positions above the line of travel of the staple wire downwardly into engagement therewith and along opposite sides of said anvil. two actuating cams engageable by said plunger and actuated thereby upon movement thereof on the driving and return strokes, links operatively connecting said cams with said forming dies to move the same into position above said anvil upon the return stroke of said plunger and downwardly along o posite sides of said anvil on the drive stroke thereof, a cam on said drive plunger, and spaced cooperating cams on said anvil at points spaced from the anvil surface thereof to withdraw said anvil from the path of travel of said plunger upon the drive stroke thereof and to move said anvil into the path of travel of said plunger upon the return stroke thereof.

7. In a stapler of the class described, a housing having a central forming chamber and a staple uide passageway extending therefrom having recessed converging walis guiding the legs of the staple for movement along said passageway, a staple drive plunger guided for movement into said chamber and within and along said staple guide passageway to the end thereof, feeding mechanism actuated by said plunger to intermittently supply wire to said chamber in increments of staple length, a rocking arm pivotally mounted on said housing and having anvil on the end thereof, spaced cams on said rocking arm, and cooperating cams on said plunger to move said anvil into said chamber upon the return stroke of said plun er and out of said chamber at the end of the staple forming operation prior to the staple driving operation of said plunger, two facing rectilinear forming dies recessed to engage the wire in the center of the recesses thereof and bend the wire to the form of said anvil upon movement of said dies along said anvil, means p-ivotally mounting said dies on said housing on opposite sides of said chamber, separate actuating cams connected with each of said dies and engaged by said plunger upon movement thereof on its driving and return strokes, a cutter block extending along the advance of said forming dies and having an inclined cutting face and a wire guide opening into said inclined face, and a shearing blade on the adjacent of said forming dies movable along said block and inclined face to sever the wire into staple length and to point the end thereof at the initiation of the staple forming stroke of said forming dies.

8. In a stapler, a housing having a forming chamber and a staple guide passageway extending therefrom, a staple drive plunger guided for movement in said forming chamber and staple guide passageway, a fluid operated motor for moving said plunger in and along said chamber and passageway, feed mechanism operated by engagement with said plunger to intermittently feed staple wire to said chamber, a lever arm pivotally mounted intermediate its ends on said housing outside of said forming chamber, an

anvil on one end of said lever arm and movable into position on one side of the line of travel of the wire into said chamber, two spaced cams on said lever arm on opposite sides of the pivotal axis thereof, a cooperating cam on said drive plunger to engage one of said cams during the driving stroke thereof to move said anvil out of the path of travel of said plunger and the second of said cams on the return stroke thereof to move said anvil to an operative position Within said forming chamber, two spaced forming dies pivotally mounted within said housing on one side of the line of travel of the wire into said chamber and movable from a position on the opposite side of the line of travel of the wire into said chamber downwardly to a position along opposite sides of said anvil, and cam means actuated by movement of said plunger on its driving stroke to move said dies along said anvil, to effect forming of the staple thereon.

9. In a stapler of the class described, a housing having a central forming chamber and a. staple guide passageway extending therefrom, a feed roll rotatably journaled in said housing and a pinch roll engageable' therewith to feed a. continuous length of wire in said housing, a ratchet device to intermittently drive said feed roll and a rocking arm to actuate said ratchet device, a lever arm pivotally mounted on said housing intermediate its ends and having an anvil on the free end thereof and carrying the same into and out of said forming chamber, two spaced forming arms pivotally mounted in said housing on opposite sides of said anvil and having forming dies on the adjacent endsv thereof to move with said arms to extend along opposite sides of said anvil, a staple drive plunger guided to move within and along said chamber and staple guide, fluid operated motor means to move said plunger in staple drive and return directions, and individual en-v gaging cams on said plunger at points spaced therealong to actuate said rocking arm and intermittent feed, to move said forming dies on their forming and retracting strokes and insert said anvil within and to withdraw said anvil from said chamber all in a predetermined sequential forming operation.

10. In a stapler, a housing having a forming chamber, a staple guide passageway extending from said chamber to the end of said housing, a staple drive plunger guided to move within and driven by said plunger to feed a continuous strip ofwire into said chamber in a direction normal to the path of travel of said plunger, an anvil .movably mounted on said housing to move into .a position on one side of the line of travel of said 2 :Wire, two forming dies pivotally mounted on said housing on opposite sides of said anvil to move from a position on the opposite side of the line of :travel of said wire from said anvil into engagement with the wire, and to form the wire on said anvil, a cutting block interposed between said feed roll and one of said forming dies and having an inclined advance face facing said anvil, a wire guide intersecting said inclined advance face, a wire shearing and pointing blade on the forming 'die adjacent said anvil and movable with said forming die along the inclined face of said cutting'block to shear a length of wire to staple length and to point the same, spaced camming surfaces on said staple drive plunger and cooperating camming means associated with said anvil, intermittent feed mechanism and forming 1 dies, to actuate the same in a predetermined staple cutting and forming sequence.

11. In a stapler of the class described, a hous- ;:ing having a stapl guide extending therefrom,

ajstaplo drive plunger guided to move Within and along said staple guide, wire feeding means operated by reciprccable movement of said plunger comprising a feed roll journaled in said housing, a'ratchet devicev operated by engagement with said'plunger to drive said feed roll, said feed roll having a converging wire engaging groove recessed in the face thereof to recess the wire par- .tially within said roll and to grippingly engage the sides thereof, a spring urged pinch roll to engage the wire with said groove, a cutter block spaced in advance of said feed roll and having a wire guide extending therethrough in alignment with the line of travel of the wire between said feed and pinch rolls and having a receding cutting face, a pivoted arm actuated to move along said face by movement of said plunger along said guide, a forming die on the free end of said arm, a second arm pivoted on the opposite side of said plunger from said first arm having a forming die thereon facing said first forming die, and an anvil pivotally mounted on said housing to move into the space between said forming dies and cooperating therewith to form the wire to staple form upon the staple forming stroke of said arms.

12. A stapler of the class described comprising 1 a housing having a staple guide nose extending therefrom with a staple guide in said nose and extending therealong, a stapl drive plunger guided for movement within and along said housing and nose and having a staple engaging recess on the end face thereof, a fluid pressure cylinder and piston on the opposite end of said housing from said nose and connected with said plunger to reciprocably move said plunger along said housing, two pivoted forming dies pivoted within said housing on opposite sides of the path of travel of said plunger therealong in widely spaced relation with respect to each other, cam means connected with said forming dies and engaged by said plunger for moving said forming dies upwardly upon the return stroke of said plunger and from the space "between said 'formin'g dies to I cooperate with said forming dies, cam mean's on said plunger engageable with said anvil upon the driving and return strokes of said plunger to move said anvil into and out of cooperative 'r'ela- 'tion with respect to said forming dies',- and--"out of the path of travel of said plungerupon" the driving stroke thereof.

13. A stapler comprising a housing-having a guide nose extending from one end thereof-and a staple guide extending within'a nd along -said nose, a staple drive plunger guided to move-within andalong said housing and nose, said" plunger having a recessed staple engaging-end face; a fluid motor mounted on the opposite end o'f said housing from said nose and having connection with said plunger to reciprocably move the same, means actuated by said plunger to intermittently feed staple wire within said housing, other means actuated by said plungento sever the wire to staple length and point the ends thereof comprising a cutting block secured within asi'dhousing and having a wire guide extending" therethrough perpendicular to said plungerand also having an inclined advance cutting face, a shearing blade movable along said face to'sever'the wire at the inclination of said face",.-'and two spaced facing forming dies pivoted within-said housing adjacent opposite sides thereof in widely spaced relation with respect to said plunger and beneath said cutter block to move'from angular positions above said wire guide downwardly along said cutter block. into positions'parallel to -s'aid plunger, one of said dieshaving said shearing blade secured thereto to move along said'inclined cutting face of said cutting block, and canrmeans connected with said dies and actuatedzby said plunger to move said forming dies into and-out of forming engagement with the staple wire.

14. A stapler comprising a'housing'having a guide nose extending therefrom with a staple guide extending within and along said nose;- a

staple drive plunger guided for movement within wire within said housing, means to sever'the wire to staple length andto point the ends thereof comprising a cutting block secured to" said housing and having an inclined cutting face and a wire guide intersecting said face, a shearing blade movable along said cutting face, two spaced facingforming dies pivoted within said housing adjacent opposite sides thereof and beneath said cutting block to move from elevated angular positions above said cutting block downwardly into parallel staple forming positions, one of said dies having said shearing blades secured thereto, a'rocking arm pivoted on the outside of saidhousing and having an anvil on one end thereof movable within said housing, cam means connected with each of said forming dies, means-on said plunger engageable with said cam means toactuate the same, and a cam on said plunger en gageable with said rocking arm and rocking the same, to extend said anvil between and withdraw said anvil from said forming dies, uponthe respective return and staple driving strokesof said plunger.

15. In a stapler of the class described, a housing having a central forming chamber, a nose extending from said housing having a staple guide chamber in incremental lengths equal to the length of the staple to be formed, a cutter block through which the Wire is trained, an anvil pivotally mounted on said housing on the outside of said forming chamber, to move into and out of said forming chamber and disposed beneath the plane of travel of the Wire into said chamber, a staple drive plunger guided to move into and out of said chamber and along said nose, two forming dies, one of said forming dies having a cutter blade thereon movable along said cutter block to cut the Wire to length, said forming dies being pivoted on opposite sides of said anvil in spaced relation with respect thereto and beneath the path of travel of the wire into said housing, 15

to move from positions above the path of travel of the wire into said housing downwardly to engage the wire and move along opposite sides of said anvil, to bend th wire to conform to said anvil, means actuated by said plunger to actuate said forming dies, and other means actuated by said plunger to move said anvil into and out of cooperative relation with respect to said forming dies.

E. GUNNAR SANDBERG.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 915,862 Hunter Mar. 23, 1909 965,588 Lay July 26, 1910 2,145,461 Smith Jan. 31, 1939 2,554,691 Zeruneith May 29, 1951 2,564,886 Epple et a1 Aug. 21, 1951 

